221534462021449 has 2 divisors, whose sum is σ = 221534462021450. Its totient is φ = 221534462021448.

The previous prime is 221534462021399. The next prime is 221534462021471. The reversal of 221534462021449 is 944120264435122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142942779633424 + 78591682388025 = 11955868^2 + 8865195^2 .

It is a cyclic number.

It is not a de Polignac number, because 221534462021449 - 2¹¹ = 221534462019401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221534462021549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110767231010724 + 110767231010725.

It is an arithmetic number, because the mean of its divisors is an integer number (110767231010725).

Almost surely, 2^{221534462021449} is an apocalyptic number.

It is an amenable number.

221534462021449 is a deficient number, since it is larger than the sum of its proper divisors (1).

221534462021449 is an equidigital number, since it uses as much as digits as its factorization.

221534462021449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 221534462021449 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred sixty-two million, twenty-one thousand, four hundred forty-nine".